For backstory, I had a voucher that was expiring in December and had a rough idea of when/where I'd be flying in July, so I just picked some days and booked a RT.
Now that the time is nearer, I'm thinking I'd probably rather stay a little longer and also fly back from a different city making it an open jaw. Until I ended up with the voucher I had just planned on using my miles, so I kind of hate to shell out $200 for a change fee. I was wondering what would happen if I just missed that return flight and used miles on a 1 way?
Airline is United if it makes a difference.